Quantumbits
Some fun with quantum physics by Dr. Olaf Hoffmann, 2008-10-07, Hannover, Germany:
How we imagine what quantumbits are -
a model of 25 time dependent bits in mixed states.
Quantum bits and quantum computingFrom classical to quantum computing
Up to today computers base on the approximation of classical
electrodynamics. Due to some scaling laws the processors got
smaller and faster in the last decades. At some point, the behaviour
is not classical anymore and other concepts and rules are
required to describe the behaviour of the processors and the
computing. For some domains the quantum mechanical behaviour
permits quite different computation methods and secure
cryptographic methods not available with classical computing.
Structures get so small, that a bit corresponds to one particle in
an quantum mechanical eigenstate, quantum computing is done
with the superposition of eigenstates of entangled states.
A quantum bit is a two level quantum mechanical system.
A classical bit has only the classical states 0 and 1, a
quantum bit can bei in a superposition of both.
Quantum computing and cryptography is based on entangeled states,
cryptography additionally on different and distant tools and a detection
with a projection in eigenstates again on one computer, which determines
immediately the state on the other computer. Bells inequality ensures,
that any attempt to spy out the message destroys the message with such
an attempt.
Description of the graphics
In solid state physics the quantum bits are typically achieved with
nanostructure and pseudoparticles called quantum dots.
The graphics represents a naive visualisation of a grid of nine
quantum bits in a 5x5 matrix changing their states from time
to time represented by the change of the opacity of each
quantum bit. Opacity 0 and 1 represent the two eigenstates,
a value between is related to a superposition of the two eigenstates
and it represents a visualisation of the probability for an eigenstate
if it would have been measured with a projection into this eigenstate.
Imperfections in the current technology are visualised with different
coloures, shapes and sizes for each quantum bit and slightly irregular
positioning within the matrix.